JPS6139324Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grain moisture content measurement device, and more particularly to a moisture content display device.

In general, in a moisture content measuring device that determines the moisture content of grain by crushing and clamping a sample shell between a pair of electrodes and measuring the electrical resistance generated between the electrodes when electricity is applied, Figure 1 shows As shown, the displayed moisture content value fluctuates for a while immediately after crushing, but eventually stabilizes. This is due to the following factors. In other words, immediately after crushing, temperature changes due to the temperature difference between the grain temperature and the electrode temperature, pressure changes between the electrodes, and changes in the density of the crushed grain are likely to occur. It is thought that this will have an impact. For this reason, conventionally, measurers have been instructed to wait until the display becomes sufficiently stable before reading the moisture content value. However, the judgment of when to read the display is subject to the subjectivity of the measurer, and some measurers may read the moisture content value even though the display is not stable enough, thus obtaining accurate moisture content. A problem occurred where the rate value could not be obtained. Furthermore, it is not preferable to not display the time until the measured value becomes stable, as this may give a sense of uneasiness to the measurer.

The purpose of this invention is to solve the above-mentioned problems, and at least for a predetermined period of time from immediately after crushing until the moisture content value stabilizes, the display is displayed incompletely to inform the measurer. In addition to informing the user that the moisture content value is not yet stable and preventing reading of the fluctuating moisture content value, the moisture content value is completely displayed after a predetermined period of time to clarify when to read it. An object of the present invention is to provide a display device for a moisture content measuring device that can measure accurate moisture content values.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 is an external plan view of a moisture content measuring device to which the present invention is applied. In the figure, reference numeral 1 denotes a housing, and a transparent window 2 is formed on the top surface of the housing, and a numerical display 3 is provided below the window 2 to digitally display the measured moisture content value. Furthermore, a power indicator light 4 is provided near this. Inside the housing 1 (not shown), a circuit board constituting a measurement circuit is fixed in a flat shape, and a battery case for power supply and measurement aids such as a rice huller, a brush, and a spoon are stored. has been done. Further, a grain crushing handle 5 is provided at the right end of the housing 1, and by rotating the handle 5, the grain interposed between the upper electrode and the lower electrode located at the bottom of the handle 5 is crushed and held. There is. The stopper 6 is provided to restrict the rotation of the handle 5 and to keep the electrode interval constant during crushing. A measurement switch 7 is provided at a position where the rotation of the handle 5 is restricted by a stopper 6, and is turned on and off by a magnet provided on the handle 5.

Next, FIG. 3 is a block diagram of a display device showing one embodiment of the present invention. A pair of electrodes 10 and 11 that measure the electrical resistance by crushing and clamping the sample shell are connected to a resistance/voltage conversion circuit 12 that converts the electrical resistance into voltage.
It is connected to the. 13 is an A/D conversion circuit that inputs the output voltage as an analog quantity from the conversion circuit 12 and converts it into a digital signal; 14 inputs the measurement data converted into a digital quantity by the A/D conversion circuit; A storage circuit 15 is a display drive circuit for displaying the measurement data stored in the storage circuit on the numerical display element 3. Reference numeral 17 denotes a timing generation circuit that receives the signal from the measurement switch 7 and generates various timing pulses during measurement;
Reference numeral 8 denotes a detection circuit for detecting whether the electrical resistance value of the sample shell crushed and clamped between the electrodes is fluctuating or stable, and this detection circuit 18 includes a storage circuit 19 for temporarily storing measurement data. , a comparison circuit 20 that compares the measurement data newly stored in the storage circuit 14 and the measurement data stored in the storage circuit 19 and outputs an output signal when the difference is within a predetermined value; and a measurement start. It is comprised of a timer 21 that measures a predetermined time from . Further, 22 is a memory switching circuit which inputs a signal from the detection circuit 18 and switches the storage of measurement data in the memory circuit 14. The above, A/D conversion circuit 13,
The detection circuit 18 and the memory switching circuit 22 operate at timings according to timing pulse signals from the timing generation circuit 17, respectively.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 to 4. First, the sample shell material is crushed and clamped between the electrodes 10 and 11 by rotation of the handle 5, and at the same time, the measurement switch 7 is turned on by a magnet provided on the handle 5 to start measurement. Electrode 1
The electrical resistance value generated between 0 and 11 is converted by the resistance/voltage conversion circuit 12 into a voltage which is an analog quantity corresponding to the measured moisture content value, and then further converted into a digital quantity by the A/D conversion circuit 13. It is temporarily stored in the storage circuit 14 as measurement data M1. Next, the measurement data stored in the storage circuit 14
M1 is displayed as a moisture content value on the numerical display element 3 via the display drive circuit 15, and is compared with the contents of the storage circuit 19 by the comparison circuit 20 of the detection circuit 18. However, before this, no measurement data was stored in the storage circuit 19, so the difference with the measurement data M1 compared in the comparison circuit 20 was not within a predetermined value (for example, within ±0.1%). Therefore, the output signal of comparison circuit 20 is not output. The timer 21 measures a predetermined time simultaneously with the operation of the comparison circuit 20. Next, after the measurement data M1 is temporarily stored in the memory circuit 19, the memory switching circuit 22
erases the measurement data M1 stored in the storage circuit 14. This erasure is performed by the comparison circuit 20 and the timer 2.
When any one of the 1 output signals is input to the memory switching circuit 22, the switching is not performed. Since the measurement data M1 stored in the memory circuit is erased, the moisture content value displayed on the numerical display element 3 is no longer displayed. Each of the circuit operations described above is performed based on timing pulses from the timing generation circuit 17, and thereafter the circuit operations described above are repeated at a period T, and measurement data Mn is newly input to the storage circuit 14 at each period. is stored and simultaneously displayed as a moisture content value on the numerical display element 3 for a time t1. While this display is being performed, the comparison circuit 20 compares the measurement data Mn with the previous measurement data (Mn
-1) is compared. The comparison circuit 20 is configured so that the difference between the measurement data to be compared is within a predetermined value (for example, ±
0.1%), it is detected that the electrical resistance value of the grain crushed and clamped between the electrodes has reached a stable state, and an output signal is output to the memory switching circuit 22. As a result, immediately after the start of measurement, the period T and the display time T1
The measurement data stored in the memory circuit 14, which is repeatedly memorized and erased and displayed intermittently on the numeric display element 3, is fixedly stored and continuously displayed on the numeric display element 3. Become. timer 2
1 is set to a predetermined time that is measured from the start of measurement and times up when the fluctuation in the electric resistance value becomes sufficiently stable, and usually times up after the comparator circuit 20 outputs a signal. The memory switching circuit 22 permanently stores the measured data in the memory circuit 14 even in response to the time-up signal of the timer 21, and even if the output signal of the comparison circuit 20 is not output, the numeric display element 3
The moisture content value can be displayed. From now on, this moisture content value will be displayed by rotating the handle 5 in the opposite direction and turning the measuring switch 7.
Continues until turned off.

Next, FIG. 5 is a block diagram of a display device showing another embodiment of the present invention. Portions common to those in FIG. 3 are given the same reference numerals, and their explanation will be omitted. 2
3 is a clock oscillation circuit that oscillates a reference clock for timing timers and other controls;
4 is a microcomputer that includes a processing unit (CPU) 25 that performs various data processing and arithmetic processing, and a read-only memory (ROM) 26 that stores programs in advance, calculation results, input data, etc. A readable and writable data random access memory (RAM) 27 consisting of a plurality of storage areas for temporary storage, an input data buffer 28 for inputting data from the A/D conversion circuit 13 and the measurement switch 7, and a numeric display element 3.
It is composed of a display control circuit 29 and the like for displaying the moisture content value.

Next, FIG. 6 is a diagram showing a flowchart of the program. This program is stored in the read-only memory 26, and the A/D conversion circuit 13, numeric display element 3, etc. connected to the microcomputer 24 operate according to this program.
The operation of this flowchart will be explained below. First, the program starts by turning on a power switch (not shown). Next, it is determined whether the measurement switch 7 is ON. When the measurement switch 7 is turned on, the A/D conversion circuit 13 is operated, and the output voltage of the resistance/voltage conversion circuit 12 corresponding to the electrical resistance value of the sample shell crushed and clamped between the electrodes 10 and 11 is determined. Convert to digital quantity and input. The input measurement data M1 is temporarily stored in the RAM 27, and then passed through the display control circuit 29 and displayed as a moisture content value by the numerical display element 3. Next, the timer TA on the program starts timing. The setting time of the timer TA is set in advance to be the time from the start of measurement until the electrical resistance value of the sample shell crushed between the electrodes becomes sufficiently stable as the measurement time passes. Therefore, while the timer TA does not time up, the displayed moisture content value is considered not to be sufficiently stable and is thereafter displayed intermittently on the numerical display element 3 at a period T and a display time t1. The measurer knows from this intermittent display that the moisture content value is not yet stable. Next, when the timer TA times up, the measurement data Mn stored in the RAM 27 immediately before that time is fixedly displayed on the numerical display element 3 as a moisture content value. In this state, the handle 5 is rotated in the opposite direction,
This continues until the measurement switch 7 is turned off.

Next, FIG. 7 is a diagram showing a flowchart of another program. The explanation of the operation of the parts common to the flowchart of FIG. 6 will be omitted.
The measurement data Mn stored in the RAM 27 is compared with the previous measurement data (Mn-1) and the difference is 4m.
The absolute value of (Mn−Mn−1) is a predetermined value (for example, 0.1
%) or more, the displayed moisture content value is considered not to be sufficiently stable and is thereafter displayed intermittently on the numerical display element 3 at a period T and a display time t1. The measurer knows from this intermittent display that the moisture content value is not yet stable. Also timer To
performs an operation corresponding to the timer 21 in FIG. Next, the difference △m (Mn−Mn−1) in the measurement data
When becomes below a predetermined value, the moisture content value is considered to be sufficiently stable, and the measurement data Mn stored in the RAM 27 immediately before is fixedly displayed on the numerical display element 3 as the moisture content value. This state continues until the handle 5 is rotated in the opposite direction and the measurement switch 7 is turned off. In the above embodiment, the moisture content value is displayed blinking as an incomplete display while the moisture content value is not stable, and the moisture content value is displayed fixedly as a complete display after the moisture content value is stabilized. However, in addition to this classification, complete display means that the entire display is legible, while incomplete display means that only the numerical part is displayed or masked to make it difficult to read, or the brightness is reduced. Incomplete display can be achieved by lowering the display, or incomplete display can be achieved by erasing the decimal point display.Complete display is not limited to the fixed display of moisture content values, as long as it can be classified as opposed to this.
Also, the measurement switch 7 is linked to the handle 5.
Although it turns on and off, the measurement switch is not limited to this, and a measurement switch that is not linked to the operation of the handle 5 may be used.

As described above, according to the present invention, the moisture content value is displayed incompletely for a predetermined period of time from immediately after crushing until the moisture content value stabilizes, thereby informing the measurer that the moisture content value is not yet stable. At the same time, the moisture content value can be completely displayed after a predetermined period of time has elapsed, making it clear when to read the data and making it possible to accurately measure the moisture content value.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the fluctuation characteristics of the moisture content value with respect to the measurement elapsed time after crushing, Fig. 2 is an external plan view of a moisture content measuring device to which an embodiment of the present invention is applied, and Fig. 3
The figure is a block diagram of a display device which is an embodiment of the present invention, FIG. 4 is a time chart for explaining the operation of FIG. 3, FIG. 5 is a block diagram of a display device using a microcomputer, and FIG. , Figure 7 is the fifth
It is a figure which shows the flowchart of the operation|movement of a figure. 3...Numeric display element, 5...Handle, 7...
Measuring switch, 10, 11... Electrode, 12... Resistance/voltage conversion circuit, 13... A/D conversion circuit, 1
7...timing generation circuit, 18...detection circuit,
20... Comparison circuit, 21... Timer, 24...
Microcomputer, 26...ROM, 28...
...Input data buffer.

Claims (1)

[Claims for Utility Model Registration] (1) In a moisture content measuring device that crushes and clamps a sample shell material between a pair of electrodes and measures a moisture content value from an electrical resistance value generated between the electrodes, the electrical resistance A conversion means for converting a value into a moisture content value, a display means for displaying the moisture content value converted by the conversion means, and a display device provided between the conversion means and the display means to control the display state of the display means. display control means to display the moisture content value incompletely at least for a predetermined time immediately after crushing;
A display device for a moisture content measuring device, characterized in that the display state is set to a complete display after the predetermined time has elapsed. (2) A display device for a moisture content measuring device according to claim 1, wherein the display control means provided between the conversion means and the display means is a timer. (3) A utility model characterized in that the display control means provided between the conversion means and the display means is a detection means for detecting a stable state of the moisture content value from the fluctuation value of the moisture content value with respect to the elapsed measurement time. A display device for a moisture content measuring device according to claim 1.